Say you have a control named Knob 1 and you want to map it to a Rack Extension remoteable named Filter Cutoff, all you have to do is find the line on your recently pasted Remote Template that looks like this:

//Map [TAB] _control_ [TAB] [TAB] Filter Cutoff

And change it to:

Map [TAB] Knob 1 [TAB] [TAB] Filter Cutoff

Notice how I removed the initial "//" characters to make that line active (lines starting with // are comments) and changed the "_control_" to "Knob 1".

So this kind of editing for the rest of the controls of your controller that you notice are used in the other Scopes (other mapping blocks related with the other Reason devices).

Be extra careful not to remove any existing TAB character, respecting the format shown above.

9) When you're done, save that .remotemap file.

10) Start Reason and check if all this trouble worked :)

If you're already running Reason, then use this little trick to re-load that Remote Map:

Go to Edit, Preferences..., Control Surfaces and locate the controller you've been editing the map.

Uncheck the "Use with Reason" check mark and check it again. This will reload the recently edited map file.

You can keep using this trick while keeping the map file open in the file editor. Each time you save a change, do this uncheck/check thing and it'll get re-loaded into Reason.

If there's something wrong with the changes you did, Reason will "complain" with an error warning (a big red cross button) that you can press to see what's wrong.

Try to fix the issue, if you understand what you did wrong, save the file and try again the reload trick.

If you're unsure what's going on and you're getting nowhere with your edits, maybe you should close the editor, replace the file with the early backup (the original map file before your edits), use the reload trick to use that and... ask for help here :)

I'll soon add some snapshots and provide a more detailed explanation to this process, if needed (i.e. if anyone complains that this doesn't work or it's too confusing).

Good luck and... if you do your own Remote Templates, please check the existing list and if it's a new one, post it. This should be a community effort to try and "fix" something some (fortunately not all) RE Developers keep forgetting to add to their documentation: Their Rack Extension Remote Implementation list.